Atmospheric Chemistry of (CF&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;CHOCH&lt;sub&gt;3&lt;/sub&gt;, (CF&lt;sub&gt;3&lt;/sub&gt;)&lt;sub&gt;2&lt;/sub&gt;CHOCHO, and CF&lt;sub&gt;3&lt;/sub&gt;C(O)OCH&lt;sub&gt;3&lt;/sub&gt;

Freja From Østerstrøm (1503850); Timothy J. Wallington (1261167); Mads P. Sulbaek Andersen (1503847); Ole John Nielsen (1503853)

JOURNAL ARTICLE

Atmospheric Chemistry of (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3

Freja From Østerstrøm (1503850)Timothy J. Wallington (1261167)Mads P. Sulbaek Andersen (1503847)Ole John Nielsen (1503853)

Year: 2016 Journal: OPAL (Open@LaTrobe) (La Trobe University) Publisher: La Trobe University

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Abstract

Smog\nchambers with in situ FTIR detection were used to measure rate coefficients\nin 700 Torr of air and 296 ± 2 K of: k(Cl+(CF3)2CHOCH3) = (5.41 ± 1.63) ×\n10–12, k(Cl+(CF3)2CHOCHO) = (9.44 ± 1.81) × 10–15, k(Cl+CF3C(O)OCH3) = (6.28\n± 0.98) × 10–14, k(OH+(CF3)2CHOCH3) = (1.86 ± 0.41) ×\n10–13, and k(OH+(CF3)2CHOCHO) = (2.08 ± 0.63) × 10–14 cm3 molecule–1 s–1. The Cl atom initiated oxidation of (CF3)2CHOCH3 gives (CF3)2CHOCHO in a yield\nindistinguishable from 100%. The OH radical initiated oxidation of\n(CF3)2CHOCH3 gives the following\nproducts (molar yields): (CF3)2CHOCHO (76 ±\n8)%, CF3C(O)OCH3 (16 ± 2)%, CF3C(O)CF3 (4 ± 1)%, and C(O)F2 (45 ±\n5)%. The primary oxidation product (CF3)2CHOCHO\nreacts with Cl atoms to give secondary products (molar yields): CF3C(O)CF3 (67 ± 7)%, CF3C(O)OCHO\n(28 ± 3)%, and C(O)F2 (118 ± 12)%. CF3C(O)OCH3 reacts with Cl atoms to give: CF3C(O)OCHO\n(80 ± 8)% and C(O)F2 (6 ± 1)%. Atmospheric lifetimes\nof (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3 were estimated\nto be 62 days, 1.5 years, and 220 days, respectively. The 100-year\nglobal warming potentials (GWPs) for (CF3)2CHOCH3, (CF3)2CHOCHO, and CF3C(O)OCH3 are estimated to be 6, 121, and 46, respectively. A comprehensive\ndescription of the atmospheric fate of (CF3)2CHOCH3 is presented.

Keywords:

Atmospheric chemistry Torr Atmospheric pressure Radical Atmosphere (unit) Fourier transform infrared spectroscopy Primary (astronomy) Atom (system on chip) In situ Atmospheric emissions

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Atmospheric Chemistry of (CF<sub>3</sub>)<sub>2</sub>CHOCH<sub>3</sub>, (CF<sub>3</sub>)<sub>2</sub>CHOCHO, and CF<sub>3</sub>C(O)OCH<sub>3</sub>

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